Pump-drive for marine motors



F. TESSNER. PUMP DRIVE FOR MARINE MOTORS- APPLICATION FILED MAY 11, 1920.

1,363,289. v Pa ted D c- 28, 1920.

G yn am PATENT OFFICE.

FRANK TESSNER, 0F MILWAUKEE, WISCONSIN.

PUMP-DRIVE FOR MARINE MOTORS.

Specification of Letters Patent.

Patented Dec. 28, 1920.

Application filed May 11, 1920. Serial No. 380,696.

l arly of that type known as portable detachable motors.

As is customary in marine engines of the internal combustion type, these detachable motors are provided with a cooling system, which includes a pump for forcing a continuous stream of water through the water jacket of the cylinder or cylinders. I-Ieretofore it has been customary to operate this pump through a cam located on the main propeller shaft within the gear housing.

As a result of such construction, there is a likelihood of considerable leakage of water into the gear housing owing to the fact that it is almost impossible to effectively pack the plunger which operates the pump and which extends into said housing. The many disadvantages of having water leak into the gear housing is obvious.

It is therefore the primary object of this invention to provide a suitable arrangement whereby the usual pump may be actuated by an arrangement entirely outside of the gear housing.

With this general object in View, the .in vention resides in the novel features of construction, combination and arrangement of parts which will be hereinafter more particularly described and claimed and shown in the accompanying drawing, wherein:

The single figure represents a side eleva tional View, partly in section, of the lower or propeller end of a detachable marine motor showing one means for operating the water circulating pump.

Referring more particularly to the drawing, it will be seen that the illustrated form of motor includes a propeller 1 formed in connection with a cap 2 and mounted on a propeller shaft 3, a gear shaft 4%, and bevel gears 5 and 6. The former gear 5 is keyed upon the shaft 4: and the gear 6 similarly fixed to the shaft 3, and these parts are in closed in a gear case 7 and a sleeve 8. The gear case carries a propeller protector 9.

Surrounding the sleeve 8 which forms a housing for the gear shaft 4 is a sheet metal casing 10, and disposed therearound is a second sheet metal sleeve 10 and this sleeve 10 serves as a support for a pump casing 11. The pump casing is preferably secured thereto by means of a split sleeve or the like 12. The upper end of the pump casing is designed to be connected through a nipple 13 and a flexible tube (not shown) with the water jacket of the engine cylinder, also not shown. Water is forced from this cylinder 11 by means of a reciprocating piston or plunger 14. The manner of actuating this pump piston forms the basis of the present invention.

Referring therefore to Fig. 1, it will be seen that the cap '2 of the propeller is provided with an external cam 15, and that a plunger 16 has its lower end resting on the peripheral surface of this cam and reciprocates as the cam revolves, or in other words as the propeller 3 rotates. For the purpose of holding the plunger 16 in parallel relation to the axis of the gear shaft 4, I provide the gear casing 7 with a sleeve 17 but there is no access through this sleeve to the interior of the former.

The upper end of the plunger 16 is connected with a sliding contact plate 18 which surrounds the casing 10 and engages the outwardly projecting end of the pump piston 14;. By this arrangement it will be no ticed that the pump piston will be properly reciprocated in synchrony with the rotation of the propeller shaft 3, but in view of the fact that the cam 15 is formed on the outer surface of the propeller cap, there is no possibility of water leaking into the gear casing 7.

From the foregoing description taken in connection with the accompanying drawing, it will be obvious that I have invented means for operating the ordinary pump of detachable marine motors without utilizing a driving connection extending from the gear casing to the pump piston. In other words with the arrangements illustrated, I can readily actuate the pump without danger of having water leak into the gear casing to thus spoil the lubrication and render the motor inefiicient.

I claim:

In a marine propulsion mechanism, a watertight shaft connection housing, a drive shaft extending into said housing, a propeller shaft disposed in said housing and having one end extended therefrom, a driving connection between the shafts within the housing, a cooling system pump, a slidable member engageable with the pump for operating the same upon movement thereof, a propeller secured on said propeller shaft by means of its hub and disposed entirely outside of said housing, and a cam'disposed on said propeller hub for rotation therewith, said cam being in connection with said slidable member for moving the same, whereby the pump will be operated by means docated outwardly of the housing, thereby eliminating the possibility of leakage of water and other foreign material thereinto.

In testimony that I claim the foregoing I have hereunto-set my hand, at Milwaukee, in the county of Milwaukee and State of Wisconsin.

FRANK TE SSNER. 

